Watercolour a. ink drawing, 31 x 31,5 cm, lo. ri. sign. Maetzel, framed under glass, uninspected out of frame. - Painter, architect, graphic artist a. sculptor. M. studied architecture in Hannover, Dresden a. Paris in 1901 a. worked in urban development in Hamburg. In 1919 he was among the co-founders of the Hamburg secession a. its chairman until 1933. He is one of the main exponents of Hamburg expressionism.